Iodine and Starch Experiment | Iodine Experiment | Starch Experiment | Science experiments for kids

Iodine and Starch Experiment | Iodine Experiment | Starch Experiment | Science experiments for kids

Simple and easy experiment to demonstrate the iodine with starch reaction!

For this test you will need:
• Two test tubes
• Soluble starch powder
• Iodine solution
• Water
• Dropper
• Put some starch powder into a test tube and fill the test tube with water.
• Mix the starch in the test tube well until the starch dissolves in the water.
• Fill the other test tube with normal water.
• Place both the test tubes in a test tube stand.
• Using a dropper take iodine solution.
• Put some drops in each test tube.
• Observe that the test tube with starch solution turns to purple black color.
• The other test tube with normal water retains the color of iodine i.e orange or yellow.
Starch is a mixture of amylose and amylopectin, which are different forms of glucose/starch.
Amylose in starch is responsible for the formation of a deep blue black color.
Amylase is long polymer chains of glucose units connected by an alpha acetal linkage and looks much like a coiled spring.
However iodine is a potassium iodide reagent and it is not very soluble in water.
So, iodine is prepared by dissolving it in water in an aqueous solution of potassium iodide. This results in a linear tri-iodide ion (I3−) complex in iodine which is soluble.
This tri-iodide ion (I3−) slips into the coil of the starch causing an intense or deep blue-black color.



21 responses to “Iodine and Starch Experiment | Iodine Experiment | Starch Experiment | Science experiments for kids”

  1. Allison Evans Avatar

    Where can I buy the iodine for this? I bought some iodine at drug store, but it is clear and is not working with the corn starch to turn blue. Desperate to figure this out!

  2. Nathan Deuxieme Avatar

    This seems like an awful waste of materials. I mean, why fill 3/4 of the tube. 1/6 works just fine unless you're blind or something and can't see the color.

  3. Pajs Docue Avatar

    What kind of starch, is it corn starch?


    Hola todos ijos de puta le voi a dar dislake

  5. عمار معن Avatar

    Thanks, homework done! Loool

  6. fil x Avatar

    Ok i understood nothing of that and i already did the experiment this dude needs to get his jank together

  7. Hoe but make it fashion Avatar

    when my science class did it it was strictly purple, then again the iodine was diluted

  8. Mariya Avatar

    i don't think a kid can understand all the Amylose thing.. lol
    So, when we add Amylase to the iodine and starch, will it be digested and color will change from blue to yellow again?

  9. محمد الفتلاوي Avatar

    Please can I know why the color disappeared in addition of alkali and reappear in addition acid ?

  10. Luna Salazar Avatar

    isnt it supposed to be hot water?

  11. violinsheets Avatar

    Lol we did this in ochem class because we're learning about sugars. Helpful thanks.

  12. JustaRandomGuy Avatar

    nationella provet, aye

  13. Daniel Avatar

    Can I eat it?

  14. musicislife5683 Avatar

    obviously the narrator has no idea what he's talking about. reagent is pronounced ree-ay-jent, and the I3- ion is a complex ion, not "complex". it doesn't mean anything when he says that "iodine is a potassium iodide reagent," because obviously iodine is in potassium iodide (based on the name) but iodine is not solely involved in reactions as a reagent to form potassium iodide. the rest is okay, but don't rely on the video's explanation for the color change too much. 

  15. paurca Avatar

    no me entero de nadajajajajajaja

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